#include <iostream>

int main() {
    int fac(int n);
    int i;
    for (i = 1; i <= 5; i++) {
        printf("%d! = %d\n", i, fac(i));
    }
    return 0;
}

int fac(int n) {
    static int f = 1;
    f *= n;
    return (f);
}
